Turbulent vortex dipoles in a shallow water layer
Turbulent vortex dipoles in a shallow water layer
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浅水层中的湍流涡旋偶极子
DOI：
10.1063/1.1762912
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发表时间：
2004
影响因子：
4.6
通讯作者：
J. Sommeria
中科院分区：
文献类型：
--
作者：
D. Sous;N. Bonneton;J. Sommeria
本文描述了浅水层中湍流偶极涡的实验研究。偶极子是由脉冲水平射流产生的，通过该射流产生局部三维湍流区域。偶极子的出现仅受约束数C=Q/H2 tinj的控制，而射流雷诺数Re=Q/v在研究范围内没有影响50 000 2，流动成为准二维和一个单一的涡偶极子出现在大多数情况下。 通过定性观测和粒子图像测速技术的应用，确定了主要的偶极子特征。浅水偶极子的特点是同时存在几个尺度的湍流：大尺度的准二维主流和小尺度的三维湍流运动。在偶极子阵面上有一个垂直环流。一个理论模型是…
This paper describes an experimental study on turbulent dipolar vortices in a shallow water layer. Dipoles are generated by an impulsive horizontal jet, by which a localized three-dimensional turbulent flow region is created. Dipole emergence is only controlled by the confinement number C=Q/H2tinj whereas the jet Reynolds number Re=Q/v has no influence in the studied range 50 000 2, the flow becomes quasi-two-dimensional and a single vortex dipole emerges in most cases. By qualitative observations and application of particle image velocimetry, the main dipole features have been determined. The shallow water dipoles are characterized by the simultaneous presence of several scales of turbulence: A quasi-two-dimensional main flow at large scale and three-dimensional turbulent motions at small scale. A vertical circulation takes place in the dipole front. A theoretical model i...